Feeding behavior of 5 species filter-feeding bivalves on Paralichthys olivaceus feed,fecal and sediment particulates in cage farming area

5 species bivalves’ feeding behavior on different food,including flounder(Paralichthys olivaceus)faeces,residul feed and deposition was studied so as to discuss the potential IMTA based on filter-feeding bivalves.Results showed the 5 species bivalves could feed on fish faeces,residul feed and deposition.However,different species showed different feeding behaviors.Ingestion rates of oyster,clam and scallop were significantly higher than the other 2 species(two-way ANOVA,P<0.01),and absorption efficiency(AE)and absorption rate(AR)of the 5 species bivalves were not significantly different.Diet had significant influence on the feeding behavior.With particle organic matter(POM)increasing,AE increased.There were significantly linear relationship between AR and POM.TPM threshold for pseudo-feces production of oyster and scallop and was 26.24,21.64,27.00 mg/L,respectively,and the 5 species bivalves could regulate food intake by pseudo-feces production.The shellfish+fish IMTA mode,clam Ruditapes philippinarum,oyster Crassostrea gigas and scallop Chlamys farreri are relatively good candidate species.